Across
- 3. a person’s characteristic emotional reactivity and intensity
- 4. Dizygotic twins occur when two separate eggs are fertilized by two different sperm. These two fertilized eggs then develop independently. Dizygotic twins share the same type of genetic relationship as non-twin siblings, hence the term fraternal.
- 6. a random error in gene replication that leads to a change
- 9. “survival of the fittest”. The idea that inherited traits that better enable an organism to survive and reproduced will likely be passed on
- 10. a sequence of nucleotides that form a chromosome. “unit of heredity”
- 11. common genetic profile
Down
- 1. Monozygotic twins develop when a single egg is fertilized by a single sperm and at some stage in the first two weeks the developing embryo splits in two, with the result that two, GENETICALLY IDENTICAL babies develop.
- 2. the proportion of variation among individuals that we can attribute to genes
- 5. a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
- 7. the effect of one factor (such as environment) depends on another factor (such as heredity)
- 8. a self-replicating material which is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
- 12. the subfield of biology that studies the molecular structure and function of genes